Mostafa Benzaazoua

Mostafa Benzaazoua
Mohammed VI Polytechnic University · EMEC - MECE (Mining Environment and Circular Economy)

PhD, HDR
MECE Program lead

About

327
Publications
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Introduction
Applied mineralogy Geochemistry and contamination evaluation Waste integrated management Ore and waste processing and valorization Solidification stabilization processes

Publications

Publications (327)
Article
This paper investigates the properties of a mixture design of three tender marls as a binder. The used marls are by-products of open-pit phosphate mine. At first, ten mixtures with diverse combinations of calcined marl (CM) were blended with cement at a ratio of 1:1. The properties of those blends were tested including hydration kinetics, setting t...
Article
Environmental desulfurization by froth flotation is a promising technique for the control of acid mine drainage (AMD) and has already been applied in a wide variety of mining operations to prevent environmental risks. This paper aims to address the flotation challenges of gersdorffite for environmental purposes. Gersdorffite, a Ni-As-sulfosalt (NiA...
Article
Full-text available
The aims of this paper was to evaluate the efficiency of phosphates product and by-products from the Djebel Onk mine for the control of acidic mine drainage generated by exposure of Sidi Kamber mine tailings to climatic conditions. Kinetic tests in humidity cells were carried out according to the modified ASTM standard, was used to invistigate the...
Article
The adsorption mechanisms of the collectors O-isopropyl-N-ethyl thionocarbamate (IPETC) and potassium amyl xanthate (PAX) on a covellite surface were studied through microflotation tests, Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations. The microflotation test...
Article
Landfilling of mine and industrial waste streams leads to environmental and economic issues. Sustainable management methods through valorization in manufacturing green construction materials are a current research interest. Here, a promising process for recycling mine tailings, such as phosphate sludge, is proposed. A mixture of phosphate sludge, k...
Article
Full-text available
In Tunisia, phosphate beneficiation from ores by the Gafsa Phosphate Company (GPC) is a water-intensive process that generates large amounts of sludge. Responsible mining minimizes water use and prioritizes its recycling and reuse to limit the impact on water resources. Recovery of water from the phosphate sludge (PS) using the densification with a...
Article
Bio-based flotation reagents are of great interest considering their low-cost, abundance, and sustainability. This study evaluates the performance of saponified vegetable oils as collectors in phosphate ores’ flotation. Olive, nigella, and flaxseed oils were elected for their fatty acid composition and their local availability. Prior to saponificat...
Article
Full-text available
Until 2008, the Aldermac mine was considered one of the most problematic abandoned mines sites in Québec due to the high production of acid mine drainage caused by mine tailings spread over a large area. The site was reclaimed between 2008 and 2009 to reduce the ecological footprint and to minimize any further tailings oxidation (production of acid...
Article
Pollution of soils, surface, and groundwater can be of natural or anthropogenic origin. Mine drainage is one of the sources of metal emissions into the environment, affecting the ecological systems and human population. In this respect, the abandoned Erdouz mine (Occidental High Atlas, Morocco) was used as an example. However, the objective of this...
Article
MgO-Belite calcium sulfoaluminate low carbon clinker (BCSAC) was successfully synthetized from a raw meal containing more than 77 wt% of phosphate by-products: 67 wt% of phosphate mining waste rocks and 10 wt% of phosphogypsum (PG: CaSO4·2H2O), while the remaining portion was Kaolin clay. The obtained clinker could be considered as an environmental...
Conference Paper
The high demand on cementitious materials evolves increasingly alongside with their harmful impact in terms of emitted carbon dioxide. The use of alternative materials that require less energy as raw materials for cement manufacture would be of a supreme added value. Mine exploitation generates a considerable quantity of by-products that can be use...
Article
Covellite usually occurs accompanying other copper minerals, like chalcopyrite and chalcocite, but there are few studies on covellite flotation. The effect of collectors O-isopropyl-N-ethyl thionocarbamate (IPETC) and potassium amyl xanthate (PAX) and pH on covellite and pyrite flotation was investigated through a Hallimond tube test using pure cov...
Article
Management of mine wastes (e.g., waste rock and tailings) is becoming an increasing global environmental concern for mining industries around the world. With environmental regulations becoming more restrictive, there is a continuously growing need to develop efficient and clean integrated techniques to sustainably manage mine wastes. Mines wastes o...
Article
In cemented paste backfill (CPB), tailings are commonly bound with Portland cement (GU) blended with ground granulated blast furnace slag (GGBFS) and/or fly ash (FA). Instead of using GU, alkali activation of GGBFS and FA is possible; this alternative has been intensively investigated in the concrete field. However, the development of an alkali-act...
Article
Full-text available
Weathering cell test, designed specifically to overcome material-limited constraints, yields prompt and efficient experimental assessment during the development stages of mining projects. However, it has barely benefited from geochemical modeling tools despite their ease of use. Accordingly, this paper aims to strengthen the upstream geochemical as...
Article
Full-text available
The phosphate industry produces huge volumes of waste (hundred million tons per year). These wastes are generally surface landfilled, leading to significant environmental impacts and a large footprint. The current practices of phosphate waste management, the typology of the waste streams and their characteristics, and finally their potential applic...
Article
Large quantities of waste rocks are removed during ore extraction particularly in open pit mining and stored at the surface in piles. When these materials contain reactive minerals and are exposed to surface environmental conditions, they can generate contaminated mine drainage. A new approach of construction of waste rock piles using inclined comp...
Article
Passive abiotic treatment of acid mine drainage (AMD) was investigated using phosphate mining residuals (raw low-grade phosphate ore, phosphatic limestone wastes, and phosphate mine tailings) from the Djebel Onk mine, Algeria. Laboratory batch tests were performed using the main expected lithologies of phosphate materials in contact with synthetic...
Article
Full-text available
Cemented paste backfill (CPB) offers an environmentally sustainable way to utilize mine tailings, one of the largest waste streams in the world. CPB is a support and filler material used in underground mine cavities, which consists of mine tailings, water, and binder material that usually is cement. Replacing cement with secondary raw materials lik...
Chapter
Full-text available
The main objective of a stabilization/solidification (S/S) technology is to reduce the risks related to disposal and/or use of contaminated materials by minimizing the leaching of potential contaminants. Cement shows high strength, low permeability, and good durability, which make it a suitable material for the S/S of inorganic hazardous wastes. Re...
Chapter
Sediments contamination by organic and inorganic pollutants presents a serious risk to human health, fauna, and flora. Stabilization/solidification (S/S) is one of the most used techniques for the management of contaminated sediments. It aims to improve the mechanical and geochemical properties of contaminated sediments by adding cementitious mater...
Chapter
Responsible management of acid mine drainage (AMD) treatment sludge (AMD sludge), in accordance with increasingly restrictive environmental regulations, is of crucial importance. Stabilization/solidification (S/S) of AMD sludge is considered a sustainable management method before landfilling or disposal to limit its environmental impacts. Most of t...
Article
The use of mine wastes as alternative materials to finite natural resources in the construction sector is a sustainable solution to better protect the environment and manage solid wastes. This paper aims to investigate the integrated valorization of silver mine tailings (RST) through the recovery of residual silver by froth flotation and ecofriendl...
Article
Full-text available
Mining produces significant amounts of solid mineral waste. Mine waste storage facilities are often challenging to manage and may cause environmental problems. Mining waste is often linked to contaminated mine drainage, including acidic waters with more or less elevated concentrations of trace metals such as lead. This work presents a study on the...
Article
Full-text available
This review summarizes the major research and scientific findings on the relevance of using calcined marl as supplementary cementitious material in developing eco-friendly cement for the next generation. Incorporation of calcined marl into cement can result in changes in the properties of these binders, and thus compatibility with other additions c...
Article
In the mining industry, the extraction of waste rocks (WR), without economic value, is needed to access ore deposits. The amount of WR are very large in the case of open pit mines. They are usually stored at the surface in waste rock piles. The presence of reactive minerals such as sulphides in waste rock can lead to the contamination of drainage w...
Article
Full-text available
Acid mine tailings may affect several environmental matrices. Here, we aimed to stabilize acid-generated mine tailings using several alkaline and cementitious amendments, which were tested in columns for 361 days. The alkaline amendments consisted of 10 and 20 wt.% limestone, while the cementitious amendments consisted of different binders at a tot...
Article
Full-text available
During open-pit mining operations of phosphates, huge volume of rocks by products are accumulated and deposited in the mine site. The aim of this paper is to investigate the use of marls as an only aluminosilicate precursor to produce alkali-activated geopolymers. Marls from Moroccan phosphate basins are composed of carbonates, quartz and clays. Ra...
Article
Mine tailings exposed to water and oxygen generate acid mine drainage (AMD) when the neutralizing minerals are insufficient to buffer the acid produced by sulfide oxidation. Mineral reactivity, such as sulfide oxidation and carbonate dissolution, leads to several changes within mine tailings in terms of their physical, mineralogical, and geochemica...
Article
Full-text available
Citation: Qureshi, A.; Bussière, B.; Benzaazoua, M.; Lessard, F.; Boulanger-Martel, V. Geochemical Assessment of Desulphurized Tailings as Cover Material in Cold Climates. Minerals 2021, 11, 280.
Article
Full-text available
The anthropogenic pollution of lake ecosystems by human activities (e.g., mining industries) is recognized as a serious issue. The Osisko urban lake located in Rouyn-Noranda (Quebec, Canada) was used partially as a waste disposal facility for many decades, causing a heavy pollution. The main undertakings of this study are (i) assessing the mineralo...
Article
Large volumes of waste rock (WR) are generated in open-pit mines. WR is characterised by high anisotropy in its physical, chemical, mineralogical, and hydrogeological properties. WR is often deposited in unsaturated piles on the mine surface. Mineralogical investigations defined the diameter of physical locking of sulphides (DPLS) allowing the WR t...
Article
Waste rocks resulting from phosphate mining extraction operations are characterized by a mix of lithological formations variety occurring within the phosphate sequence. Among this variety of co-products, flint is omnipresent in important quantities and considered as waste. This study investigates the feasibility of using flint as full aggregate rep...
Article
Full-text available
The way to successfully upgrade a phosphate ore is based on the full understanding of its mineralogy, minerals surface properties, minerals distribution and liberation. The conception of a treatment process consists of choosing the proper operations with an adequate succession depending on the ore properties. Usually, froth flotation takes place in...
Article
Ceramics are considered as a promising pathway to reduce the large amount of continuously produced industrial wastes. This study aims to valorize phosphate mine by-products alongside with fly ashes to produce fired bricks. Different mixes containing up to 30% of fly ashes were prepared, molded and sintered at 1100 °C. The sintered ceramics and raw...
Article
This paper investigates the characteristics of nine different wastes from phosphate extraction mines and their potential applications. These materials are generally extracted and landfilled in dumps as they do not present any added value. Therefore, it is aimed to highlight the potential uses of these materials based on their chemical and mineralog...
Article
Full-text available
Worldwide, the mining industry played a very important role in the first industrial revolution during the previous century [...]
Article
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Checking the presence of sesquioxide (Fe2O3, Al2O3) is helpful for its removal in advance. Therefore, the occurrence of sesquioxide in a mid-low grade calcareous-siliceous collophane ore (massive carbonate-apatite, also known as francolite) from Guizhou, China was determined by X-ray fluorescence spectroscopy (XRF), X-ray diffraction (XRD), field e...
Article
Full-text available
The quantities of waste rocks and tailings generated by the mining industry have been increased in the last decades. The accumulation and the surface storage of these mine wastes represents a real challenge in terms of environmental and health issues. Thus, the recycling and valorization of these mine wastes is one of the most effective ways of red...
Article
Mining operation produces significant volumes of waste rocks (WR) characterised by high heterogeneity in their physical, mineralogical and hydrogeological properties. The purposes of this study were to assess the acidgenerating potential, evaluate reprocessing feasibility of polymetallic WR using desulphurisation process (i.e., gravity separation a...
Article
Reuse of mine waste as alternative raw material in the construction sector is a promising environmental solution. The aim of this study was to evaluate the potential use of phosphate sludge as alternative raw material in the production of fired bricks, while substituting the natural finite clay soils. Representative samples of phosphate processing...
Conference Paper
The increasing production and consumption of cement in the world leads to the generation of high amounts of greenhouse gas emissions leading to serious global warming and environment pollution. The use of supplementary cementitious materials has shown promising results towards carbon footprint reduction. In this paper, it is aimed to evaluate the p...
Conference Paper
The use of phosphate mine waste rocks as non-conventional materials in road construction is an appropriate approach to limit the ecological footprint of phosphate mining sites and to promote resource-saving of natural aggregates. The main objective of this investigation is to evaluate the possibility of valorizing phosphate waste rocks in road cons...
Article
In sedimentary phosphates mining operations, clayey layers are removed as mine wastes. The main objective of this paper was to investigate the feasibility to valorize these mine wastes as Lightweight aggregates (LWAs) by mixing them with organic wastes (sawdust and coffee grounds) which act as pore-forming agents. Thermal transformations and micros...
Article
Full-text available
This paper deals with the potential reuse of coal mine waste rocks (CMWR) as an alternative material for road construction to conserve the natural resources and sustainable management of mining waste. The investigation was conducted through the determination of the chemical, mineralogical, geotechnical properties, and acid mine drainage formulation...
Article
Highlights-The influence of hydraulic hysteresis and mineralogical composition on the hydro-geotechnical behavior of phosphate mine waste rocks (PMWR) was assessed-Collapse/swelling potential of PMWR upon wetting was studied-The PMWR can be used under dry conditions in ordinary embankment under total pressure below 200 kPa-The findings of this stud...
Article
The phosphate industry produces great amounts of waste-rocks during their mining activities in extraction and beneficiation steps. Waste-rocks are stored immediately on extraction sites or in the vicinity of treatment facilities. Different types of waste-rocks are generated, yet this paper discusses the use of stone-removal waste-rocks as aggregate...
Preprint
This work evaluates the potential use of clays by-products produced during phosphate mining as a novel supplementary cementitious material. The evaluation was conducted through (i) determination of physical , chemical, and mineralogical characteristics of samples (ii) the evaluation of clays thermal activation from 500 to 900°C, and (iii) the asses...
Article
This paper investigates the characteristics of nine different wastes from phosphate extraction mines and their potential applications. These materials are generally extracted and landfilled in dumps as they do not present any added value. Therefore, it is aimed to highlight the potential uses of these materials based on their chemical and mineralog...
Article
This study aims to explore the feasibility of using waste red clay from a sedimentary, interlayered phosphate deposit to produce a geopolymer mortar without any pre-treatment. Alkali activated mortars were prepared by mixing fly ash or slag with red clay and sand, using different fly ash or slag/red clay ratios. The effects of sodium silicate to so...
Article
Residues from passive treatment of acid mine drainage (AMD) have variable chemical stability and could regenerate contaminated drainage. Stabilization/solidification (S/S) can prevent contaminant leaching. Residues were collected from a tri-step AMD field passive treatment system, operated for 6 years at the reclaimed Lorraine mine site, Quebec, Ca...
Article
Geopolymers are aluminosilicate materials geosynthesized by alkaline activation of aluminosilicate minerals and/or industrial byproducts. This study seeks to understand the geopolymerization processes that could occur in Al/Si-rich mine tailings for producing geopolymer paste backfills (GPB). To do so, the alkaline dissolution of fifteen, commonly...
Article
In closed or abandoned mine sites, passive systems are often used for acid mine drainage (AMD) treatment. They generate metal-rich residues with variable chemical stability, which is rarely reported. The objective of the present study was to evaluate the potential mobility of contaminants (metals and sulfates) from AMD post-treatment residues to be...
Article
Open-pit mining generates a large volume of waste rocks (WR) that are deposited as unsaturated piles on the surface. WR are mainly characterised by the high heterogeneity of their hydrogeological, mineralogical and physical proprieties. The main objectives of this study consist of: i) a detailed characterisation of WR from Canadian Malartic mine in...
Article
Full-text available
Treatment efficiency of iron-rich acid mine drainage (AMD; pH 3, and 2 and 4 g/L Fe) was tested in a laboratory tri-unit pilot-scale reactor (2.65 m3) for 1 year. The first unit consisted of a passive biochemical reactor (PBR1), filled with reactive mixture (50% of manure, sawdust, maple chips, compost, urea, sediment, and sand; 50% of calcite), wi...
Article
Yellow clays from Moroccan phosphate mines are extracted with other waste rocks lithologies and stored in large dumps within the mine site. The present paper investigates the use of this by-product as a new aluminosilicate source for geopolymers elaboration at the laboratory scale. Yellow clays studied are mainly composed of montmorillonite, dolomi...
Article
Passive systems are promising for the treatment of acid mine drainage (AMD) but generate metal-rich solids or residues. In subarctic climate, freezing/thawing (F/T) cycles may influence the chemical stability of waste, including residues from AMD passive treatment. The objective of this study was to assess and better understand the effect of F/T cy...
Article
It is aimed in this paper to suggest novel alternatives to recycle phosphogypsum (PG) in road applications. The performance of several formulations for the stabilization of raw PG with other selected materials was evaluated. The research began with a feasibility study of using raw phosphogypsum alone as embankment material, then focusing on the eff...
Article
Water separation and recovery through thickening require adapted flocculants and densification processes. This study aimed to maximize water recovery from phosphate sludge (PS) at Kef Shfeir mine operation, Gafsa Phosphate Company, Tunisia. Representative samples of PS, PS treated with flocculant (F-PS), raw water, and recycled water were collected...
Article
Full-text available
The mining industry continues to face many challenges due to its potential environmental impacts [...]